Creating a control flow
1. On the Activity Diagram tab, click the 
Control Flow button.
Control Flow button.2. On the Activity Diagram, click the source item.
The source item can be any control node item or action node item: an Accept Event Action, Opaque Action, Call Behavior Action, Call Operation Action, Send Signal Action, Activity Final Node, Decision Node, Flow Final Node, Fork Node, Initial Node, Join Node or Merge Node.
3. On the Activity Diagram, click the destination item.
The destination item can be any control node item or action node item: an Accept Event Action, Opaque Action, Call Behavior Action, Call Operation Action, Send Signal Action, Activity Final Node, Decision Node, Flow Final Node, Fork Node, Initial Node, Join Node or Merge Node.
4. Type the name of the Control Flow, and then press the Enter key.
5. If you want to specify that the Control Flow interrupts an Interruptible Region (applies only when the Control Flow starts inside an Interruptible Region and ends outside the Interruptible Region):
1. Open the Control Flow's Property Pages.
2. Click the Items tab.
3. In the Show Associated list, select Interrupts.
4. Click the 
Link button.
Link button.5. Select the check box associated with the Interruptible Region that is interrupted by the Control Flow, and then click OK.